(3R,S)-N'-[N-3.beta.-Hydroxylup-20(29)-en-28-oyl]-8-aminooctanoyl]-3-amino-isobutyric acid 174740-51-3 AIDS-033508 AIDS033508 Betulinic acid NH-HepCONHEtCOOH deriv. Propanoic acid, 3-[[8-[[(3.beta.)-3-hydroxy-28-oxolup-20(29)-en-28-yl]amino]-1-oxooctyl]amino]-2-methyl-